Press for the manufacture of bricks, tiles, and similar articles



Feb. -17. 1925. 1,527,062

R. NAVET PRESS FOR THE MANUFACTURE OF BRICRS, TILES, AND SIMILAR ARTICLES Filed Feb. 14, 1924 I N VEN T on R EIIIULFHE. NHVET FITTURNEY Patented Feb. 17, 1925.

@FFICE.

RODOLPHE NAVET, OF TUBIZE, BELGIUJME.

PRESS FOR THE MANUFACTURE OF BRICKS, TILES, AND SIMILAR ARTICLES.

Application filed February 14, 1924. Serial No. 692,793.

To all whom it may concern:

Be it known that l, Rononrrrn NAvn'r, a subject of the King of the Belgians, and resident of Tubize, Belgium, have invented certain new anduseful Improvements in Presses for the Manufacture of Bricks, Tiles, and

Similar Articles, of which the following is a specification.

In presses for the manufacture of bricks, tiles, plates and the like, the pressure on the piston is generally obtained by means of a beam which, when raised at one end pushes the piston upwardly swinging around its other fixed end. Said beam or lever there fore has arms of practically constant length.

However the material to be pressed varying frequently: clay, slag, ashes, lime, cement and the like, as well as the thickness and nature of the articles to be manufactured, it will be understood that the pressure to be produced on the mould by the piston is also to be changed according to each particular case in order to obtain perfect finished products. Again when treating the same material toproduce similar articles, the pressure produced depends on the operator so that, all other conditions remaining the same, the result obtained will vary according to the power and size of the operator. However it is an important feature to obtain the same finished article without regard to the operators, and with the same operator to increase and decrease the pressure according to the material and nature of the articles to be manufactured. The length of the upward stroke of the piston must also be adjustable.

On the other hand if the movement of the operators arm during the pressing operation is considered, it will be seen that the operator first produces a pull on the operating lever which pull will progressively decrease to become nil at the moment, the hand coming to the height of the shoulder. the pu l will be converted into pressure, the lever being more and more inclined. Thus it will be seen that in the curve representing thrstress of the operator-4f he does not change his position-there will be a point of inflexion adj acent which the stress will be very much reduced. This constitutes a serious objection, adherent to all machines in which the operator has to produce a pull and then a pressure on the lever. It will be understood that an upward stroke of the piston corresponding to each angular movement of the lever and the resistance opposed to said stroke remaining the same or rather increasing, the operator cannot easily pass the dead centre and he is frequently obliged to stand back or use both hands. In any case there will be an increase of fatigue for the operator.

The object of my present invention is:

(1) To allow the variation of the power and resistance arms of the beam, the point of application of the resistance remaining substantially fixed.

(2) To stop or nearly stop the upward stroke of the piston in the neighborhood of the point of inflexion mentioned, sothat the light stress produced at this moment by the operator will only serve to move the lever through the dead centre. This result may be obtained in different ways, and in the accompanying drawings I have illustrated one preferred embodiment by way of example.

Fig. 1 shows the supporting frame for the pivot pin of the pressure beam.

Fig. 2 shows the support for the pivot-pin of the operating lever, enabling the length of the power arm of the pressure beam to be varied.

Fig. 3 shows the system of transmission from the operating lever to the pressure beam.

Referring to Figs. 1 and 2, the pivot pin 1 of the beam 2 is inserted into one of the recesses 3 in a part 4 secured to the frame of the machine. The end of the beam is provided with corresponding recesses 5, whereby the pivotal point may be changed and the resistance arm increased or decreased without changing the pow-er arm. The length of the latter may also be changed by making the pivot-pin 6 of the operating lever 7 adjustable along a fixed part on the frame, said operating lever 7 transmitting the stress of the operator to the beam (through a suitable transmission). Said adjustment may be effected by means of a number of adjusting holes 8 provided in the fixed part 9 and serving to receive bolts attaching the bearings of the pivot-pin 6.

Referring to Fig. 3, the rear part of the beam 2 is submitted to the stress of the operating lever 7 through the medium of a small lever 10 the free end of which is equipped with a roller 11 and which is mounted on the pivot-pin of the operating lever 7. The lever lO audits :roller 11 are not- :located in the vertical plane of the beam 2, but some- I,

belng formed with a plurality of pivot openwhat outside thereof so that the transmission of power will not be effected directly from the roller 11 totheibeam 2, bntthrongh the agency or" a part 12 secured to thebearn and on the lower rim otwhich acts said roller 11. Said rim is made of a special profile .or vcross section: an upwardlylinclined portion 13 corresponding to ,the traction periodon the operating lever. Thena depression 14 whereby the beam (and therefore the piston) is allowed .to be not raised during the passage through the dead centre, and at least an inclined portion 15 corresponding to the pressure period ion, the operating lever. It will be understoodthat owing tolthe part 12 securedtotheibeam', the operator may easily pass beyond hisshoulder joint with constanteflort. Ofcourse-said part .12 will beadjustable onrthebeam, 2.

As an example and fora normalroperator or workman the duration ofcthe-contact of the roller 11 with each ofthe three portions of the part 12 should.co-rrespond+the operating lever swinging through an angle of 72-to arevolution of said lever of289 for the portion 13, l8rfor the portion 14v and 26 for the portion 15.

portion.

Having now fully described my said invention, what I claim and desire to secure by Letters Patent, is:

, 1. In ,akpress, a frame support, a pressure beam, said pressure beam and frame support ings, 'saidpivot openings being formed partly in each OfSfLld members, and a pivot pm adapted to cooperate with either of said openings without changing the relation of the frame support and pressure beam, to

thereby vary, the leverage of thebeam.

2. In a press,,apressure beam, an operat mg lever,-and;means interposed between said ,lev'eiyan'd beam to substantia ly ul ify the effect of the lever onthebeanrduring a portion of the lever movement intermediate the initial and final movements orsuch lever.

3. In a press, a pressure beam, an operab ting lever,.and a section securedto said beam totbe engaged by, sa1d.lever for the opera-a1 tion of the beam, the lever engaging portion ofsaidsectionbeing interrupted for a portion of xits length to permit an operative movement of the lever without materially afiecting movement of the beam during cooperation oflthe lever with saidinterrupted In testimony whereof Ihave hereunto set my hand.

RODOLPHENAVET. 

